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JEE Advanced 2018 Paper 1
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© examsnet.com
Question : 53
Total: 54
The probability that, on the examination day, the student
S
1
gets the previously allotted seat
R
1
, and
NONE
of the remaining students gets the seat previously allotted to him/her is
3
40
1
8
7
40
1
5
Validate
Solution:
Required probability
=
4
!
(
1
2
!
−
1
3
!
+
1
4
!
)
5
!
=
9
120
=
3
40
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